Kate Hudson (Getty) Kate Hudson has a track record for staying impeccably fit—and if you don't believe me, just check out her ab-tastic appearances on Glee. How does she keep her physique so flawless? Pilates. Her trainer of 15 years explained precisely why the method is so powerful: "It primarily works your core, but not just the front. You’ll work the entire body—front, sides, back, your whole midsection, trunk—it pulls everything in and together. You’ll become tighter, more toned, and stronger." [Shape]

And in case you need any more convincing, here are Kate's abs in all their glory:

Do you take a strong stance on the diet vs. exercise debate? I've always figured both were equally important. Until now. [Women's Health]